alarms: compose subtag reference from object's real Galaxy area for exact alarmmgr parity

src/ZB.MOM.WW.MxGateway.Server/Galaxy/GalaxyRepository.cs

@@ -135,7 +135,8 @@ public sealed class GalaxyRepository(GalaxyRepositoryOptions options) : IGalaxyR
         {
             rows.Add(MapAlarmRow(
                 fullTagReference: reader.GetString(0),
-                sourceObjectReference: reader.GetString(1)));
+                sourceObjectReference: reader.GetString(1),
+                area: reader.GetString(2)));
         }
         return rows;
     }
@@ -151,16 +152,23 @@ public sealed class GalaxyRepository(GalaxyRepositoryOptions options) : IGalaxyR
     ///     schema does not expose an ack-comment address and the watch-list resolver
     ///     composes it later.
     ///     </para>
+    ///     <paramref name="area"/> is the owning object's real Galaxy area (its alarm
+    ///     group), resolved via <c>gobject.area_gobject_id</c>; the watch-list resolver
+    ///     composes the canonical reference from it so the synthesized reference's group
+    ///     matches what the native alarmmgr (wnwrap) emits.
     ///     Exposed internally so the derivation can be unit-tested without a database.
     /// </summary>
     /// <param name="fullTagReference">The alarm-bearing attribute reference.</param>
     /// <param name="sourceObjectReference">The owning object reference (tag name).</param>
+    /// <param name="area">The owning object's Galaxy area (the alarm group).</param>
     internal static GalaxyAlarmAttributeRow MapAlarmRow(
         string fullTagReference,
-        string sourceObjectReference) => new()
+        string sourceObjectReference,
+        string area) => new()
         {
             FullTagReference = fullTagReference,
             SourceObjectReference = sourceObjectReference,
+            Area = area,
             AckCommentSubtag = string.Empty,
         };
 
@@ -307,7 +315,9 @@ ORDER BY r.tag_name, r.attribute_name";
     // object. It projects just what the watch-list needs — full_tag_reference (tag_name +
     // '.' + attribute_name, matching AttributesSql) and the owning object's tag_name as
     // source_object_reference. The array `[]` suffix is intentionally omitted: an
-    // alarm-bearing attribute is a scalar anchor, not an array body.
+    // alarm-bearing attribute is a scalar anchor, not an array body. It also projects the
+    // owning object's real Galaxy area (via gobject.area_gobject_id) as area_name so the
+    // watch-list resolver composes a reference whose group matches the native alarmmgr.
     private const string AlarmAttributesSql = @"
 ;WITH deployed_package_chain AS (
     SELECT g.gobject_id, p.package_id, p.derived_from_package_id, 0 AS depth
@@ -354,8 +364,11 @@ ranked AS (
 )
 SELECT
     r.tag_name + '.' + r.attribute_name AS full_tag_reference,
-    r.tag_name AS source_object_reference
+    r.tag_name AS source_object_reference,
+    ISNULL(area.tag_name, '') AS area_name
 FROM ranked r
+INNER JOIN gobject g ON g.gobject_id = r.gobject_id
+LEFT JOIN gobject area ON area.gobject_id = g.area_gobject_id
 WHERE r.rn = 1
     AND r.src_pri = 0
     AND EXISTS (